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You answered "C". Click "CONTINUE" to proceed to the next question.
Interesting fact:
Materials science has come up with some amazing inventions. Take aluminium oxynitride, often incorrectly referred to as "transparent aluminium": the see-through ceramic is four times tougher than glass, insanely scratch-resistant, and withstands temperatures of up to 1200 °C! It's also prohibitively expensive, starting at $15,000 per square metre.
Fact Lab
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